Copper-silicon-aluminum alloys



25 about Patented Mar. v23, 1937 UNITED STATES PATENT-OFFICE I COPPER-8111053 33 1 1 ;N IIMIALLOIHYS v Daniel B; Hull, Water-town, Oonm, asaiznor to he American Brass. Company, Waterbury, Com, a corporation of Connecticut No Drawing. Application August 3,1933,- Serial 3 Claims.

ance, hardness and strength over that of copper,

worked to produce but which can be hot or cold various articles.

The addition of silicon .to copper in certain proportions hardens the copper and increases the tensile strength, toughness, and resistance to corros'ion. It, however, also increases thedifliculty of workingthe metal. 1 J

I have found that the addition of aluminum in 5 certain amounts to the coppersilicon alloy facili-v tates the working, or that it improves the worlia bility of the alloy, and especially hot rolling and extruding, and it can also be cold rolled. Thealuminum also further increases the strength 20 and hardness.

The relative proportionsof the. elements may vary depending on the use to which the alloyis to be put, the silicon content varying from about 0.1% up to about 3.5%,. the aluminum from 0.1% to about 0.75% and the balance copper; while the preferred range is from about 2% to 3% silicon, from about 0.1% to about 0.5%

aluminum and balance copper. A specific alloy which has been found very useful and to have the characteristics noted is composed of approximately 3% silicon, 0.3% aluminum and balance copper. a

These alloys are adapted for various uses.

They maybe hot rolled, extruded, and cold rolled. They may be made into wire, rods, tubes, sheets and various shapes. They may also be drawn, stamped, formed or spun into cups and other forms of .draw'n metal articles. In short they may be made into various articles by hot rolling, cold rolling, extruding, drawing, or spinning, or any combination of these various operations.

. 15 Having thus set forth the nature of my in-,

vention, what I claim is: u

1. A copper base alloy composed of from 0.1% to 3.5% silicon, from 0.1% to 0.75% aluminum,

and balance copper. 2o

2. A copper base alloy composed of approxi-- mately 2% to 3% silicon, 0.1% to 0.5% alumi-v mum, and balance copper.

3. A copper base. alloy composed of approximately.3%' silicon, 0.3% aluminum and balance 25 copper. DANIEL R. 

